Tuesday’s the day: Microsoft is X-ing out Windows XP, pulling support for the operating system nearly 13 years after its release. But with some estimates showing XP is still installed on more than a quarter of the world’s PCs, will they now become a prime target?

Human breast milk is sold for babies on several online sites for a few dollars an ounce, but a new study says buyer beware: Testing showed it can contain potentially dangerous bacteria including salmonella.